I came across the Kong duck while searching for gear; if you havenít seen one itís a tiny ascender that can be used on webbing (including daisy chains!).

http://www.kong.it/doc/KONG_DUCK.pdf

The large hole for the carabineer would reduce the friction when youíre pulling and the toothless cam would allow it to be released under load. The clip in point for the crab would also be really short.

It may work fine straight onto a standard daisy (clipping a crab into the loose end of the daisy so it canít slip through the duck). But.. If you could get a custom webbing strap made up (or buy a fish/Yates replacement) you would have a rated full strength adjustable daisy!

This is obviously a bit of big wall theorising so I would be interested to hear opinions before I go out and buy a pair.

I came across the Kong duck while searching for gear; if you havenít seen one itís a tiny ascender that can be used on webbing (including daisy chains!).

http://www.kong.it/doc/KONG_DUCK.pdf

The large hole for the carabineer would reduce the friction when youíre pulling and the toothless cam would allow it to be released under load. The clip in point for the crab would also be really short.

It may work fine straight onto a standard daisy (clipping a crab into the loose end of the daisy so it canít slip through the duck). But.. If you could get a custom webbing strap made up (or buy a fish/Yates replacement) you would have a rated full strength adjustable daisy!

This is obviously a bit of big wall theorising so I would be interested to hear opinions before I go out and buy a pair.

This is a similar idea to what they use in the arborist and rope access worlds, only they use a full-strength rope with a Gibbs/Rescuescender-type device or a Grigri...

That was the idea. The duck and webbing are alot more compact though. 2 grigris might be overkill BUT on the other hand if you had long tails as well you might be able to do some interesting rope tricks.